postgresql inner join code example

Example 1: update with inner join postgres

update xtable x 
set col1 = y.col1
from ytable y 
where y.x_id = x.id;

Example 2: psql join

SELECT *
    FROM weather INNER JOIN cities ON (weather.city = cities.name);

Example 3: postgres join

-- This is in postgreSQL

-- We have tableA and tableB, x is primary key in tableA and also
-- a foreign key in tableB as y
SELECT * FROM tableA JOIN tableB ON tableA.x = tableB.y;

-- This will select all the columns from both tables that share a key

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